AutoCodes – Chrysler – C0021 Chrysler

C0021 Chrysler Code - Brake Booster Performance

Quick Answer

When the Vacuum Pressure Sensor indicates a failure in the Vacuum Booster. Common causes include Faulty Brake Booster, Faulty Vacuum Pressure Sensor, Vacuum Pressure Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C0021 Chrysler indicates Brake Booster Performance.
Common causes: Common causes include Faulty Brake Booster, Faulty Vacuum Pressure Sensor, Vacuum Pressure Sensor harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 10,138

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0021 Chrysler Description

When the Vacuum Pressure Sensor indicates a failure in the Vacuum Booster. After the cold start phase (i.e. 3 min after engine is running) and if the engine is running above 600 RPM there should be at least -200 mbar (-2.90 psi) of differential pressure in the vacuum-chamber for boosting the pedal force. If the pressure remains below this value for more than two minutes. Timer resets if the pressure remains above 220 mbar (3.19 psi) for 10 seconds.

OBDII Code C0021 Chrysler - Brake Booster Performance - AutoCodes.com — C0021 Chrysler Code - Brake Booster Performance

What does this mean?

What are the Possible Causes of the DTC C0021 Chrysler?

Faulty Brake Booster
Faulty Vacuum Pressure Sensor
Vacuum Pressure Sensor harness is open or shorted
Vacuum Pressure Sensor circuit poor electrical connection

How to Fix the DTC C0021 Chrysler?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0021 Chrysler code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C0021 Chrysler code?

Need more information on how to fix the C0021 Chrysler code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0021 Chrysler code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C0021 Chrysler Code

1. What are the common symptoms of OBDII code C0021 for Chrysler related to brake booster performance?

The common symptoms include a stiff brake pedal, inconsistent brake pedal feel, and potential loss of brake assist.

2. What are the possible causes of OBDII code C0021 related to brake booster performance in a Chrysler vehicle?

The code C0021 is typically triggered by issues with the brake booster itself, such as vacuum leaks, faulty check valves, or a failing brake booster sensor.

3. How can I diagnose the cause of OBDII code C0021 in my Chrysler vehicle?

Diagnosing the issue may involve checking for vacuum leaks, testing the brake booster sensor, inspecting the brake booster check valve, and ensuring the proper operation of the brake booster.

4. Is it safe to drive my Chrysler vehicle with OBDII code C0021 related to brake booster performance?

It is not recommended to drive the vehicle with this code as it can affect the performance of the brakes and compromise safety. Immediate attention and repair are advised.

5. Can I reset the OBDII code C0021 for brake booster performance in my Chrysler without repairs?

Resetting the code may temporarily turn off the warning light, but it will likely reappear if the underlying issue with the brake booster is not addressed.

6. How much does it typically cost to repair OBDII code C0021 related to brake booster performance in a Chrysler vehicle?

The cost of repair can vary depending on the specific cause of the issue, but it may range from $200 to $600, including parts and labor.

7. Are there any DIY tips for troubleshooting OBDII code C0021 in my Chrysler related to brake booster performance?

While some basic checks like inspecting for visible vacuum leaks can be done DIY, diagnosing and repairing brake booster issues often require professional expertise and specialized tools.

8. Can a faulty brake booster affect the overall braking performance of my Chrysler vehicle?

Yes, a faulty brake booster can impact the overall braking performance by reducing brake assist, making the pedal feel stiff, or causing inconsistent braking.

9. How long does it take to repair OBDII code C0021 related to brake booster performance in a Chrysler at a professional service center?

The repair time can vary depending on the exact cause of the issue, but it typically takes a few hours to a full day to diagnose and resolve brake booster problems.

10. Is OBDII code C0021 related to brake booster performance a common issue in Chrysler vehicles?

While not as common as some other OBDII codes, brake booster performance issues leading to code C0021 can occur in Chrysler vehicles, especially in older models or those with high mileage.